Heating system for aircraft



March 19, 1946.

H. J. DE N. MCCOLLUM HEATING SYSTEM FOR AIRCRAFT Filed June 1, 1942 Patented ar. 19, 1946 Henry J, lie McCollum, McCollum' 'executix of McCollum, 'deceased .Application .June .1, 1942,` semina. 4455311 v (o1. 237--1236 utilize the same fuel which is plane engine.

An object of Another object of my invention is to provide an aircraft heating system which is more 'ecientand more flexible than those now in use.

Other objects and advantages will .become apparent as the description proceeds.

The single figure of the drawing isa diagrammatic view illustrating an installation embodying my invention.

In the drawing I have .illustratedx'part of. an and an engine having a radial engine I4 for driving.

aircraft, cell l2, one of the planes propellers.

comprising a cabin l The engine'y I4 is or other particular design of engine or to any particular design of supercharger.

Pipe I8 connects the supercharger I6 with the It will be understood by those skilled in the art that the heaters may be of any conventional supplied by a supercharger I6 with a combustible or other planes', or lin fact any desired location lor locations inany othe vehicle. Y

Ai-rr'iportant feature rof my invention lies in provisionfor reducing the fue] consumption of the englilne 2B when the pressure developed by the -super'charger 16 is adequate to supply thev fuel needsl vof the" individual heaters. In order to "accomplislfli this, YI have provided a by-pas's 50 around the mixture. pump 2-2. is providedwith a che'ckrvalve 52' which prevents" reverse ilow'of iiuid from the pump outlet to the y able or usual construction, but' preferably offers noappreeiable resistance tothe flow of iiuid from the pipe 121i through.' by-p'as's 5&3 t'o manifold 30.-

.Amm ucorinects Aa manifold 39 with theA con- In the operation of my invention, charger. IE6` isdriven mixture from the discharge to the intake side of the pump 22. As the pressure developed by the supercharger I6 increases, the pressure in manifold 30 will increase and valve 58 Will shift to a position restricting the iow of fuel to the This by-pass 5D aff responsive to the pressure in said manifold for regulating the position of said throttle valve, a by-pass around said pump, and a low pressure check valve in said by-pass for preventing return flow therethrough.

4. A heating system comprising a supercharger, an internal combustion engine supplied with fuel from said supercharger, a positive displacement pump driven by said engine, means connecting theV intake of said pump with said supercharger,

. a manifold into which said pump discharges, a

the combustible mixture supplied by the super;

charger by-passes pass 5B and check valve 52. Because of the low resistance of the check valve 52, the pressure the manifold 30 stantially that produced by the supercharger i6. The pump 22 continues to operate'slowly, but does not increase Y bustible mixture because of the open by-pass aroundthis pump. V

, My invention is not' limited to the particular arrangement diagrammatically illustrated in the drawing, but may assume numerous While it is particularly adapted for aircraft and other vehicles, it is not limited to such use but may beutilized anywhere that a supercharger orv other source .of combustible mixture under pressure is available.

. I claim:

1.- A heating system for aircraft having a supercharger comprising an internal combustion engine supplied with fuel from said supercharger, a positive displacement pump driven by said engine, means connecting the intake of said pump with said supercharger, a manifold into which said pump discharges, a plurality of heaters connected to said manifold, a throttle valve interposed between said supercharger and said engine, means responsive to the pressure in said manifold for regulating the position of said throttle valve, a by-pass around said pump, anda low pressure check valve in said by-pass for preventing return flow therethrough.

2. A heating system for aircraft having a supercharger comprising an internal Vcombustion enginek supplied with fuel from said supercharger, a pump driven by said engine, means connecting the intake of said pump with said supercharger, a manifold into which said pump discharges, a

heater connected to said manifold, a throttle valve interposed between said supercharger and said engine, means responsive to the pressure inV said manifold for regulating the position of said throttle valve, a by-pass around said pump, and a check valve in said by-pass for preventing return now therethrough.

3. A heating system for aircraft having a source of combustible fuel under pressure, comprising an internal combustion engine supplied with fuel from said source, a pump driven by said engine, means connecting the intake of said pump with said source, a manifold into which said pump discharges, a plurality of heaters connected to said manifold, a throttle valve interposed between said supercharger and said engine, meansk the pump 22 by wayof ,by-e' the compression of the Ycom-` otherrforms.

plurality of heaters connected to said manifold,

a by-pass around said pump connecting said supercharger with said manifold, a low pressure checkvalve in said by-pass for preventing return flow therethrough, and means responsive to the pressure in said manifold for controlling the flow 'offuel'to lsaid engine.

5. In aheating system of the class described the combination of a source of combustible mixtureunder pressure, booster means operated by a part Aof. the combustible mixture supplied by said source and serving to increase the pressure cfa second part of the combustible mixture supplied Yby said source, heating means in which said last-named part is burned, automatic means for throttling the now of fuel to said booster means when the pressure created by said source reaches a predetermined value, and a by-pass around said Y booster means to supply said second part of the combustible mixture directly to said heating means when the pressurecreated by said source reaches the predetermined value.

6. In a system of the class described, the combination of a source of combustible mixture under pressure, engine means operated by a part of the combustible mixture supplied by said source, booster means driven by said engine means and serving to increase the pressure of a second part of the combustible mixture supplied by said source, means in which said last-named part is utilized; pressure' actuated means responsive to the pressure at the outlet of said booster means and the source pressure for rendering said booster means ineffective when the pressure created by said source reaches a predetermined value and a by-pass around said booster means to supply said second part ofthe combustible mixture directly to said use means when the pressure created `by said source reaches the predetermined value. f y Y 7. In a heating system of the class described. the combination cf a source of combustible mixture under variable pressure, means for segregating a first part of said mixture. means for segregating a second part of said mixture, engine means operated by said first part, booster means driven bysaid engine means and serving to increase the pressure of said second part, means in which said second part is utilized, and 'pressure actuated means for rendering said engine means and booster means ineffective when the pressure created by said source reaches a predetermined value. Y

HENRY J. DE N. MCCOLLUM. 

